TY - JOUR
T1 - Aerosol optical properties at the Lulin Atmospheric Background Station in Taiwan and the influences of long-range transport of air pollutants
AU - Hsiao, Ta Chih
AU - Chen, Wei Nai
AU - Ye, Wei Cheng
AU - Lin, Neng Huei
AU - Tsay, Si Chee
AU - Lin, Tang Huang
AU - Lee, Chung Te
AU - Chuang, Ming Tung
AU - Pantina, Peter
AU - Wang, Sheng Hsiang
N1 - Publisher Copyright:
© 2016 Elsevier Ltd
PY - 2017/2/1
Y1 - 2017/2/1
N2 - The Lulin Atmospheric Background Station (LABS, 23.47°N 120.87°E, 2862 m ASL) in Central Taiwan was constructed in 2006 and is the only high-altitude background station in the western Pacific region for studying the influence of continental outflow. In this study, extensive optical properties of aerosols, including the aerosol light scattering coefficient (σs) and light absorption coefficient (σa), were collected from 2013 to 2014. The intensive optical properties, including mass scattering efficiency (αs), mass absorption efficiency (αa), single scattering albedo (ω), scattering Ångstrӧm exponent (Å), and backscattering fraction (b), were determined and investigated, and the distinct seasonal cycle was observed. The value of αs began to increase in January and reached a maximum in April; the mean in spring was 5.89 m2 g−1 with a standard deviation (SD) of 4.54 m2 g−1 and a 4.48 m2 g−1 interquartile range (IQR: 2.95–7.43 m2 g−1). The trend was similar in αa, with a maximum in March and a monthly mean of 0.84 m2 g−1. The peak values of ω (Mean = 0.92, SD = 0.03, IQR: 0.90–0.93) and Å (Mean = 2.22, SD = 0.61, IQR: 2.12–2.47) occurred in autumn. These annual patterns of optical properties were associated with different long-range transport patterns of air pollutants such as biomass burning (BB) aerosol in spring and potential anthropogenic emissions in autumn. The optical measurements performed at LABS during spring in 2013 were compared with those simultaneously performed at the Doi Ang Kang Meteorology Station, Chiang Mai Province, Thailand (DAK, 19.93°N, 99.05°E, 1536 m a.s.l.), which is located in the Southeast Asia BB source region. Furthermore, the relationships among αs, αa, and b were used to characterize the potential aerosol types transported to LABS during different seasons, and the data were inspected according to the HYSPLIT 5-day backward trajectories, which differentiate between different regions of air mass origin.
AB - The Lulin Atmospheric Background Station (LABS, 23.47°N 120.87°E, 2862 m ASL) in Central Taiwan was constructed in 2006 and is the only high-altitude background station in the western Pacific region for studying the influence of continental outflow. In this study, extensive optical properties of aerosols, including the aerosol light scattering coefficient (σs) and light absorption coefficient (σa), were collected from 2013 to 2014. The intensive optical properties, including mass scattering efficiency (αs), mass absorption efficiency (αa), single scattering albedo (ω), scattering Ångstrӧm exponent (Å), and backscattering fraction (b), were determined and investigated, and the distinct seasonal cycle was observed. The value of αs began to increase in January and reached a maximum in April; the mean in spring was 5.89 m2 g−1 with a standard deviation (SD) of 4.54 m2 g−1 and a 4.48 m2 g−1 interquartile range (IQR: 2.95–7.43 m2 g−1). The trend was similar in αa, with a maximum in March and a monthly mean of 0.84 m2 g−1. The peak values of ω (Mean = 0.92, SD = 0.03, IQR: 0.90–0.93) and Å (Mean = 2.22, SD = 0.61, IQR: 2.12–2.47) occurred in autumn. These annual patterns of optical properties were associated with different long-range transport patterns of air pollutants such as biomass burning (BB) aerosol in spring and potential anthropogenic emissions in autumn. The optical measurements performed at LABS during spring in 2013 were compared with those simultaneously performed at the Doi Ang Kang Meteorology Station, Chiang Mai Province, Thailand (DAK, 19.93°N, 99.05°E, 1536 m a.s.l.), which is located in the Southeast Asia BB source region. Furthermore, the relationships among αs, αa, and b were used to characterize the potential aerosol types transported to LABS during different seasons, and the data were inspected according to the HYSPLIT 5-day backward trajectories, which differentiate between different regions of air mass origin.
KW - Aerosol optical properties
KW - Biomass burning
KW - Long-range transport
KW - Lulin Atmospheric Background Station
UR - http://www.scopus.com/inward/record.url?scp=85006001496&partnerID=8YFLogxK
U2 - 10.1016/j.atmosenv.2016.11.031
DO - 10.1016/j.atmosenv.2016.11.031
M3 - 期刊論文
AN - SCOPUS:85006001496
SN - 1352-2310
VL - 150
SP - 366
EP - 378
JO - Atmospheric Environment
JF - Atmospheric Environment
ER -